SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e825f576f578dc4b70c40e1ff2bd900839717df3eecd8995f365f981c620462' 
  AND token = 'E3AS/PTl9wmFvqMX7FBMedSJLH33pMJ5qy3QsYpyzLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables